<?php

namespace App\Services\Sales;

use App\Models\DepartmentUser;
use App\Models\Sales\SalesManagerDocument;
use App\Models\User;
use App\Models\UserRole;
use Illuminate\Http\UploadedFile;
use Illuminate\Support\Facades\DB;
use Illuminate\Support\Facades\Hash;
use Illuminate\Support\Facades\Storage;
use Illuminate\Support\Str;

class SalesManagerService
{
    /**
     * 영업담당자 생성
     */
    public function createSalesManager(array $data, array $documents = []): User
    {
        return DB::transaction(function () use ($data, $documents) {
            $tenantId = session('selected_tenant_id', 1);

            // 1. 사용자 생성
            $user = User::create([
                'user_id' => $data['user_id'] ?? null,
                'name' => $data['name'],
                'email' => $data['email'],
                'phone' => $data['phone'] ?? null,
                'password' => Hash::make($data['password']),
                'is_active' => false, // 승인 전까지 비활성
                'parent_id' => $data['parent_id'] ?? null,
                'approval_status' => 'pending', // 승인 대기 상태
                'must_change_password' => true,
            ]);

            // 2. 테넌트 연결
            $user->tenants()->attach($tenantId, [
                'is_active' => true,
                'is_default' => true,
                'joined_at' => now(),
            ]);

            // 3. 역할 할당
            if (!empty($data['role_ids'])) {
                $this->syncRoles($user, $tenantId, $data['role_ids']);
            }

            // 4. 부서 할당
            if (!empty($data['department_ids'])) {
                $this->syncDepartments($user, $tenantId, $data['department_ids']);
            }

            // 5. 첨부 서류 저장
            if (!empty($documents)) {
                $this->uploadDocuments($user, $tenantId, $documents);
            }

            return $user;
        });
    }

    /**
     * 영업담당자 수정
     */
    public function updateSalesManager(User $user, array $data, array $documents = []): User
    {
        return DB::transaction(function () use ($user, $data, $documents) {
            $tenantId = session('selected_tenant_id', 1);

            // 1. 기본 정보 업데이트
            $updateData = [
                'name' => $data['name'],
                'email' => $data['email'],
                'phone' => $data['phone'] ?? null,
                'parent_id' => $data['parent_id'] ?? null,
            ];

            // 비밀번호 변경 시에만 업데이트
            if (!empty($data['password'])) {
                $updateData['password'] = Hash::make($data['password']);
            }

            $user->update($updateData);

            // 2. 역할 동기화
            if (isset($data['role_ids'])) {
                $this->syncRoles($user, $tenantId, $data['role_ids']);
            }

            // 3. 부서 동기화
            if (isset($data['department_ids'])) {
                $this->syncDepartments($user, $tenantId, $data['department_ids']);
            }

            // 4. 새 첨부 서류 저장
            if (!empty($documents)) {
                $this->uploadDocuments($user, $tenantId, $documents);
            }

            return $user->fresh();
        });
    }

    /**
     * 영업담당자 승인
     */
    public function approve(User $user, int $approverId): User
    {
        $user->update([
            'approval_status' => 'approved',
            'approved_by' => $approverId,
            'approved_at' => now(),
            'is_active' => true,
            'rejection_reason' => null,
        ]);

        return $user;
    }

    /**
     * 영업담당자 반려
     */
    public function reject(User $user, int $approverId, string $reason): User
    {
        $user->update([
            'approval_status' => 'rejected',
            'approved_by' => $approverId,
            'approved_at' => now(),
            'rejection_reason' => $reason,
            'is_active' => false,
        ]);

        return $user;
    }

    /**
     * 역할 동기화
     */
    public function syncRoles(User $user, int $tenantId, array $roleIds): void
    {
        // 기존 역할 삭제
        UserRole::withTrashed()
            ->where('user_id', $user->id)
            ->where('tenant_id', $tenantId)
            ->forceDelete();

        // 새 역할 추가
        foreach ($roleIds as $roleId) {
            UserRole::create([
                'user_id' => $user->id,
                'tenant_id' => $tenantId,
                'role_id' => $roleId,
                'assigned_at' => now(),
            ]);
        }
    }

    /**
     * 부서 동기화
     */
    public function syncDepartments(User $user, int $tenantId, array $departmentIds): void
    {
        // 기존 부서 삭제
        DepartmentUser::withTrashed()
            ->where('user_id', $user->id)
            ->where('tenant_id', $tenantId)
            ->forceDelete();

        // 새 부서 추가
        foreach ($departmentIds as $index => $departmentId) {
            DepartmentUser::create([
                'user_id' => $user->id,
                'tenant_id' => $tenantId,
                'department_id' => $departmentId,
                'is_primary' => $index === 0,
                'joined_at' => now(),
                'created_by' => auth()->id(),
            ]);
        }
    }

    /**
     * 서류 업로드
     */
    public function uploadDocuments(User $user, int $tenantId, array $documents): array
    {
        $uploaded = [];

        foreach ($documents as $doc) {
            if (!isset($doc['file']) || !$doc['file'] instanceof UploadedFile) {
                continue;
            }

            $file = $doc['file'];
            $documentType = $doc['document_type'] ?? 'other';
            $description = $doc['description'] ?? null;

            // 파일 저장
            $storedName = Str::uuid() . '.' . $file->getClientOriginalExtension();
            $filePath = "sales-managers/{$user->id}/{$storedName}";

            Storage::disk('tenant')->put($filePath, file_get_contents($file));

            // DB 저장
            $document = SalesManagerDocument::create([
                'tenant_id' => $tenantId,
                'user_id' => $user->id,
                'file_path' => $filePath,
                'original_name' => $file->getClientOriginalName(),
                'stored_name' => $storedName,
                'mime_type' => $file->getMimeType(),
                'file_size' => $file->getSize(),
                'document_type' => $documentType,
                'description' => $description,
                'uploaded_by' => auth()->id(),
            ]);

            $uploaded[] = $document;
        }

        return $uploaded;
    }

    /**
     * 서류 삭제
     */
    public function deleteDocument(SalesManagerDocument $document): bool
    {
        // 물리 파일 삭제
        if ($document->existsInStorage()) {
            Storage::disk('tenant')->delete($document->file_path);
        }

        // DB 삭제
        $document->deleted_by = auth()->id();
        $document->save();

        return $document->delete();
    }

    /**
     * 영업담당자 목록 조회 (역할 기반)
     */
    public function getSalesManagers(array $filters = [])
    {
        $tenantId = session('selected_tenant_id', 1);

        // 영업관련 역할을 가진 사용자 조회
        $query = User::query()
            ->whereHas('userRoles', function ($q) use ($tenantId) {
                $q->where('tenant_id', $tenantId)
                    ->whereHas('role', function ($rq) {
                        $rq->whereIn('name', ['sales_operator', 'sales_admin', 'sales_manager']);
                    });
            })
            ->with(['parent', 'userRoles.role', 'salesDocuments']);

        // 검색
        if (!empty($filters['search'])) {
            $search = $filters['search'];
            $query->where(function ($q) use ($search) {
                $q->where('name', 'like', "%{$search}%")
                    ->orWhere('user_id', 'like', "%{$search}%")
                    ->orWhere('email', 'like', "%{$search}%")
                    ->orWhere('phone', 'like', "%{$search}%");
            });
        }

        // 역할 필터
        if (!empty($filters['role'])) {
            $roleName = $filters['role'];
            $query->whereHas('userRoles', function ($q) use ($tenantId, $roleName) {
                $q->where('tenant_id', $tenantId)
                    ->whereHas('role', function ($rq) use ($roleName) {
                        $rq->where('name', $roleName);
                    });
            });
        }

        // 승인 상태 필터
        if (!empty($filters['approval_status'])) {
            $query->where('approval_status', $filters['approval_status']);
        }

        return $query->orderBy('name');
    }

    /**
     * 상위 관리자 목록 (운영자, 영업관리)
     */
    public function getParentCandidates(?int $excludeId = null)
    {
        $tenantId = session('selected_tenant_id', 1);

        $query = User::query()
            ->where('is_active', true)
            ->where('approval_status', 'approved')
            ->whereHas('userRoles', function ($q) use ($tenantId) {
                $q->where('tenant_id', $tenantId)
                    ->whereHas('role', function ($rq) {
                        $rq->whereIn('name', ['sales_operator', 'sales_admin']);
                    });
            });

        if ($excludeId) {
            $query->where('id', '!=', $excludeId);
        }

        return $query->orderBy('name')->get();
    }

    /**
     * 통계 조회
     */
    public function getStats(): array
    {
        $tenantId = session('selected_tenant_id', 1);

        $baseQuery = User::query()
            ->whereHas('userRoles', function ($q) use ($tenantId) {
                $q->where('tenant_id', $tenantId)
                    ->whereHas('role', function ($rq) {
                        $rq->whereIn('name', ['sales_operator', 'sales_admin', 'sales_manager']);
                    });
            });

        return [
            'total' => (clone $baseQuery)->count(),
            'pending' => (clone $baseQuery)->where('approval_status', 'pending')->count(),
            'approved' => (clone $baseQuery)->where('approval_status', 'approved')->count(),
            'operators' => (clone $baseQuery)
                ->whereHas('userRoles.role', fn($q) => $q->where('name', 'sales_operator'))
                ->count(),
            'sales_admins' => (clone $baseQuery)
                ->whereHas('userRoles.role', fn($q) => $q->where('name', 'sales_admin'))
                ->count(),
            'managers' => (clone $baseQuery)
                ->whereHas('userRoles.role', fn($q) => $q->where('name', 'sales_manager'))
                ->count(),
        ];
    }
}